Key structure-activity relationships in the vanadium phosphorus oxide catalyst system

Conference · Sun Apr 01 00:00:00 EST 1990

OSTI ID:6289266

Thompson, M R ^[1]; Ebner, J R ^[2]

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1. Pacific Northwest Lab., Richland, WA (USA)
2. Monsanto Co., St. Louis, MO (USA)

The crystal structure of vanadyl pyrophosphate has been redetermined using single crystals obtained from a near solidified melt of a microcrystalline catalyst sample. Crystals that index as vanadyl pyrophosphate obtained from this melt are variable in color. Crystallographic refinement of the single crystal x-ray diffraction data indicates that structural differences among these materials can be described in terms of crystal defects associated with linear disorder of the vanadium atoms. The importance of the disorder is outlined in the context of its effect on the proposed surface topology parallel to (1,0,0). Models of the surface topology simply and intuitively account for the non-stoichometric surface atomic P/V ratio exhibited by selective catalysts of this phase. These models also point to the possible role of the excess phosphorus in providing site isolation of reactive centers at the surface. 33 refs., 7 figs.

• Research Organization: Pacific Northwest Lab., Richland, WA (USA)
• Sponsoring Organization: DOE/AD
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 6289266
• Report Number(s): PNL-SA-17971; CONF-9004254-1; ON: DE91005247
• Resource Relation: Conference: 199. national meeting of the American Chemical Society, Boston, MA (USA), 22-27 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
PYROPHOSPHATES
CRYSTAL STRUCTURE
VANADIUM COMPOUNDS
ANHYDRIDES
BUTANE
CATALYSTS
CATALYTIC EFFECTS
CRYSTAL DEFECTS
TOPOLOGY
X-RAY DIFFRACTION
ALKANES
COHERENT SCATTERING
DIFFRACTION
HYDROCARBONS
MATHEMATICS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
SCATTERING
TRANSITION ELEMENT COMPOUNDS
360602* - Other Materials- Structure & Phase Studies